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United States Patent 4981364
Douris , ê et al. January 1, 1991

Extrusion apparatus

Geyer January 1, 1991

Abstract

The apparatus is for the extrusion of thermoplastic and rubber-like materials, more particularly an apparatus which has a feed means or hopper adapted for hot or cold feed of the selected materials. The apparatus has an extruder screw-type forcing zone followed by a straining refining zone, a straining means adjustable to the acceptable particle size and arranged to refine agglomerates to the acceptable particle size, and numerous circumferential grooves which inherently develop the fast forward flow of the fluent phase material and is arranged to place the developed fluent phase material at the entrances to the straining or refining openings. The apparatus has an adequate straining opening length to provide for full extrusion capacity; intensively shears and leads off all of the process material, crossing the tooth top once only thereby achieving uniformity of processing. The apparatus has a rotor tooth top groove which intercepts all of the process material flowing through the clearance tooth top to barrel bore, from the circumferential grooves, upstream and downstream of the tooth and has the circumferential tooth top groove communicating with a concentric bore of the rotor, through numerous ports which orient the lead off process material flow lines in a radial direction.